* {
    margin: 0;
    padding: 0;
}
.w {
    width: 1200px;
    margin:  auto;
}
body {
    background-color: #f3f5f7;
}

a {
    text-decoration: none;
}
li {
    list-style: none;
}
.clearfix:before,.clearfix:after {
    content:"";
    display:table; 
  }
  .clearfix:after {
    clear:both;
  }
  .clearfix {
     *zoom:1;
  } 
  .header {
      /* margin-top: 30px;
      margin-bottom: 30px; */
      height: 42px;
      /* background-color: pink; */
      margin: 30px auto;
  }
  .logo {
      width: 198px;
      height: 42px;
      /* 其实只需量出图片盒子的宽高，把图片放进去即可 */
margin-right: 60px;
float: left;
  }
  .nav {
      height: 42px;
      line-height: 42px;
      float: left;
  }
  .nav li{
      float: left;
      margin-right: 25px;
  }
  .nav a {
      color: #86c7fc;
      font-size: 18px;
      display: block;
      padding: 0 10px;
  }
  .nav a:hover {
     border-bottom: 2px solid #00a4ff;
  }
  .search {
      float: left;
      margin-left: 70px;
      width: 412px;
      height: 42px;

  }
  .search input {
      float: left;
    width: 360px;
    height: 40px;
    border: 1px solid #00a4ff;
    border-right: none;
    outline: none;
  }
  .search button{
      float: left;
      width: 50px;
      height: 42px;
      /* 行内块元素中间有默认缝隙 */
      border: none;
      background: url(images/btn.png);
  }
  .user{
      float: right;
      margin-right: 20px;
  }
  /* .search input{
    width: 360px;
   height: 44px;
   line-height: 44px;
    outline: none;
    border-top: 1.5px solid #00a4ff;
    border-bottom: 1.5px solid #00a4ff;
    border-left: 1.5px solid #00a4ff;
    border-right: 0;
  } */
  .banner{
      height: 420px;
      background-color: #1c036c;
  }
  .banner_center{
      width: 1200px;
      height: 420px;
      background: url(images/banner2_20190819_210028.png) no-repeat top center;
  }
  .aside {
      float: left;
      height: 420px;
      width: 190px;
      background-color:rgba(0, 0, 0, 0.3);
  }
  .aside li{
      height: 45px;
      line-height: 45px;
    padding: 0 20px;
      color: #fff;
      font-size: 14px;

  }
  .aside li a{
      display: block;
      float: left;
      color: #fff;


  }
  .aside li span{
     
      float: right;
      
  }

  .aside ul a:hover{
    color: #00a4ff;
  }
  .course{
      float: right;
      margin-top: 50px;
      width: 230px;
      height: 300px;
      background-color: #fff;
      
  }
  .course h2{
      font-size: 18px;
      color: #fff;
      height: 50px;
      text-align: center;
      line-height: 50px;
      background-color: #9bceea;

  }
  .bd{
      padding: 0 20px;
  }
  .course li{
    padding: 14px 0;
    border-bottom: 1px solid #ccc;
  }
  .course li h4{
      font-size: 16px;
      color: #4e4e4e;

  }
  .course li p{
      font-size: 12px;
  }
  .course a{
      display: block;
      margin: 6px 15px ;
      height: 38px;
      width: 198px;
      border: 1px solid #00a4ff;
      line-height: 38px;
      text-align: center;
      font-size: 16px;
      color:#00a4ff ;

  }
  .goods{
      margin-top: 10px;
      height: 60px;
      line-height: 60px;
      border-bottom: 1px solid #ccc;
      background-color: #fff;
  }
  .goods h3{
      height: 60px;
    
      margin: 0 34px;
      float: left;
      font-size: 16px;
      color: #00a4ff;
  }
  .goods ul{
      float: left;
  }
  .goods ul li{
      float: left;
  }
  .goods ul li a{
      color: #050505;
      padding: 0 34px;
      border-left: 1px solid #ccc;
      border-right: 1px solid #ccc;
  }
  .goods .edit{
      float: right;
      color: #00a4ff;
      margin-right: 26px;
  }
  .tj{
      margin-top: 10px;
      /* background-color: pink; */
  }
  .t_header{
      height: 42px;
      line-height: 42px;
  }
  .t_header h3{
      float: left;
      font-size: 20px;
      font-weight: normal;
  }
  .t_header span{
      float: right;
      margin-right: 30px;
      font-size: 12px;
      color: #ccc;
  }
 .tj ul{
     width: 1225px;
 }
  .tj li{
      float: left;
      width: 228px;
      height: 270px;
      margin-right:15px ;
      margin-bottom:15px ;
      background-color: #fff;
  }
  .tj li img{
    width: 100%;
  }
  .tj li h3{
      padding: 23px;
      font-size: 14px;
      font-weight: normal;
      padding-bottom: 0;
  }
  .info{
      margin-left: 23px;
      margin-top: 20px;
  }
  .info_s1{
      color: #ff7c2d;
      font-size: 12px;
  }
  .info_s2{
      margin-left: 10px;
      font-size: 12px;
      color:#ccc;
  }